tracker.py 文件源码

def __setstate__(self, state):

        OLDEST_SUPPORTED_STATE = 4
        version = state.pop(VERSION_LABEL)

        if version < OLDEST_SUPPORTED_STATE:
            raise BaseException("PerformanceTracker saved state is too old.")

        self.__dict__.update(state)

        # Handle the dividend frame specially
        self.dividend_frame = pickle.loads(state['dividend_frame'])

        # properly setup the perf periods
        p_types = ['cumulative', 'todays']
        for p_type in p_types:
            name = p_type + '_performance'
            period = getattr(self, name, None)
            if period is None:
                continue
            period._position_tracker = self.position_tracker